oil painting        
noun uk/ˈɔɪl ˌpeɪn.tɪŋ/ us/ˈɔɪl ˌpeɪn.t̬ɪŋ/
 [ C ]油画 
a picture painted with oil paints
  [ U ]油画艺术;油画创作 
the art or process of painting with oil paints
 Idiom   
be no oil paintingidiom UK humorous 相貌平平,其貌不扬
to not be attractive
  She's no oil painting but she's got an attractive personality. 她相貌平平,可是性格很可爱。